It has been proven that in the eyes of the british, the american colonies only existed to benefit britain economically.
I hope my straight forward explanation can answer your question :)
The rail road brought several advantages to the north it helped get supplies to those who needed it it was also a way to transport soldiers
The dating of artifacts is done by a three age system based on the development of tools and technology.
Profit can be best defined as gain.
There was a strong spirit of cooperation